The recovery options are as follows:
- Basic checkup - if you check this box, SuperMemo will run a quick integrity checkup of the learning process in the current collection. It will also check the integrity of the knowledge tree
- Rebuild registries - if you check this box all registries in the collection will be rebuilt and compared with their old versions. All differences will be reported as errors. This process takes pretty long. You will want to go through it only if you experience some registry-related errors or you prepare your collection for release and want to make sure that its integrity is impeccable
- Verify tasklists - if you check this box, all task elements will be verified. SuperMemo will check if the associated task exists on the relevant tasklist and that the tasklist has not been deleted
- Verify filespace - if you check this box all files in the secondary storage (i.e. ELEMENTS subfolder) will be checked for their names, numbering, duplicates, empty filespace slots, etc. If you have made a mistake in backing up the ELEMENTS subfolder or you experimented with manual merging of two versions of ELEMENTS subfolder from two different versions of the same collection, chances are you have introduced some integrity problems in file naming. Integrity of the filespace is also often disrupted by adding new file objects while being disconnected from the secondary storage or with a wrong secondary storage setting (e.g. after changing a CD-ROM drive letter in Windows). In the latter case, SuperMemo will move all occluding files to new slots to restore full integrity of the filespace
- Rebuild lexicon - if you have done lots of lexicon editing and would like to revert to the full lexicon, you can compile the lexicon by checking this box. You may also want to use this option if you unchecked Compile lexicon on-the-fly and your lexicon is not complete. This option make take a few hours if your computer is slow. Especially, if you have added many long articles to your Incremental reading process
- Verify translation - you can use this option to make sure that your translation registry is properly sorted and that all text components in the collection are translated or reported as having their translation missing. Note that if you disconnect the translation registry from your collection, the text registry will be compressed and renumbered. This will make the translation registry useless. For that reason, you should always make sure your collection is set to use a translation registry for the translation to remain valid.
- Verify rep. history (Verify repetition history) - if you check this option, repetition history of all individual elements will be checked for missing entries. If you upgrade from early SuperMemos, this options will report errors that you can safely ignore. Repetition history is not used in the learning process; however, it is used by tools that help you analyze your past learning (past workload, past retention, past consolidation, etc.). You can see the repetition history of any given element with Shift+Ctrl+H
- Make a backup - if you check this option, SuperMemo will create a backup copy of your collection before running the recovery. You should always check this box if you do not have a recent backup of your collection. Interrupted recovery (e.g. due to power failure) can destroy your collection!
To perform a quick checkup of your learning process, do not check any boxes among Recovery Options (leave only Basic checkup). On the other hand, if you want to quickly perform a detailed checkup and recovery of the whole collection, choose Detailed and then OK (it is also recommended you check Make a backup)