SSMSBoost makes regular backup snapshots of currently opened document to disk providing you with the possibility of getting back to older
versions of your work in the future. It is not only a "backup copy" it is also a modification history (sometimes you want to restore some specific version of your script).
The feature is disk size friendly: no data will be written if there were no changes since the last snapshot.
History is saved on your disk in simple text format, however, we have added some advanced search functionality that allows you to search for previous versions
of the current document right from SSMS environment.
Search results can be compared to the currently opened document with your favorite FileDiff tool, like WinMerge.
Make sure you check SSMSBoost->Settings->Editor Contents History
for fine-tuning options :