You may also save only the changes to the database with the 'Save Changes' or 'Save Changes as' functions.
'Save Changes' saves all changes to the database 'data.arb' to a file 'data.aXX' where XX is a numbered from 01 to 99 and 00 (means 100).
This is normally much faster than saving the entire database and results in much less disc consumption.
Each time you save your changes, X is increased by one. The last 10 old data.aXX are not deleted and allow you to step to an old state.
All data.aXX are independent and you may delete old changes files without losing data (as long as the latest is unchanged)
When you start arb you can choose among the different files:
enter 'arb filename.arb' to search and load the latest changes,
enter 'arb filename.aXX' to load a user-defined version.