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    <p>Also <strong>Vim</strong> :) But what I use is much different from what <a href="https://stackoverflow.com/questions/2457975/is-there-a-tool-that-automatically-saves-incremental-changes-to-files-while-codin/2457999#2457999">kzh wrote</a>.</p> <p>I don't use a version control system for my automatic backup files, I rather want to see <strong>all versions of all files in my <code>~/vim_backup</code> directory</strong>. (Note: of course I do use git for version controlling my source files, but now we are talking about automatic backups.) The following lines in my .vimrc will make Vim create a backup file each time the file is saved. The name of the backup file is the name of the normal file plus the current date and time.</p> <p>The following lines are in my .vimrc file:</p> <pre><code>if v:version &gt;= 700 " If I have a ~/vim_backup directory, let that be the backup " " directory; otherwise do not back up. " " (Vim version earlier than 7.0 do not have the finddir function.) " if finddir("~/vim_backup") != "" set bdir=~/vim_backup/ set backup else set nobackup endif endif " We set the 'backupext' option to contain the current date and time, so " " that the name of the backup file will be the concatenation of the name " " of the normal file and the current date and time. " function! HRefreshBackup() execute ":set backupext=" . strftime(".%y%m%d_%H%M") " You may want to have %H%M%S instead of %H%M if you want to have the " " possibility of having multiple backups in a minute. " endfunction " Refresh the backup file name before each "save" " au BufWritePre * call HRefreshBackup() </code></pre> <p>Example of how my <code>~/vim_backup</code> directory looks like:</p> <pre><code>$ ls -ltr ~/vim_backup | head total 105692 -rwx--x--x 1 hcs hcs 252 2009-12-19 06:49 Sync_flash.091222_0902 -rwxr-xr-x 1 hcs hcs 819 2009-12-19 06:49 hk.091229_1637 -rwxr-xr-x 1 hcs hcs 507 2009-12-19 06:49 FOLLOW_LINK.091220_0802 -rwx--x--x 1 hcs hcs 212 2009-12-19 06:49 Cut.091230_2113 -rwxr-xr-x 1 hcs hcs 275320 2009-12-19 06:51 margitka.100116_1949 -rw-r--r-- 1 hcs hcs 80 2009-12-19 06:51 localrc_dorsu.vim.100101_1112 -rwx--x--x 1 hcs hcs 10335 2009-12-19 06:51 Video.091222_1754 -rwxr-xr-x 1 hcs hcs 1255 2009-12-19 06:51 Update.091222_1754 -rwxr-xr-x 1 hcs hcs 716 2009-12-19 06:51 SshMaker.091222_1754 </code></pre> <p>This wastes some disk space, since all versions of all files are stored . So it may be worth to periodically archive and compress them. I tried several tools to compress the set of backup files, and "rar" with the "-s" option was the best. 100 megabytes of backup files were created in the last three month, and "rar -s" compressed it to 3 MB.</p>
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    1. POIs there a tool that automatically saves incremental changes to files while coding?
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    1. COYou said ".vimrc will make Vim create a backup file each time the file is saved", but isn't the user asking for the file being saved automatically?
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    2. CORight. I was focusing on the "At the very least, I can return the document to a state prior to the mistaken change" sentence of the question.
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