Backing up the files you can't replace just seems to be common sense. But many of us don't do it because of the inconvenience or cost or we just don't remember to do it. Besides, we've never lost anything really important so we've been all right so far. I've discovered a program that makes it almost too easy to backup. You forget it's there for you.
Let's say you're only willing to back up your files daily. Most backup software gives you 3 choices: full backup, incremental backup; and differential backup. The full backup is obvious - a complete copy of all your important files is made to a separate, usually external drive. So every day you copy all your important file. Lots of time and storage required. But to find and restore a file requires looking at only one file.
The differential backup copies those files that have changed since the last full backup. You back up all your files on Sunday then on Monday just those saved or changed on Monday. On Tuesday all those changed on Monday and Tuesday. And so on. To find and restore a file takes at most looking at the original complete backup plus the most recent differential backup.
Finally, the incremental backup copies those files changed since the last backup of any kind. Thus, on Sunday you do a complete backup. On Monday copy all those files changed on Monday. On Tuesday all those files changed on Tuesday, etc. To find and restore a file takes looking through as many backup files as seven.
The product I settled on is called Premium Backup from Memeo.com. Memeo thinks outside the box. It produces what might be termed a "mirror" backup. Every time a file is saved to disk, another copy of that file is saved to a back-up disk drive. The system administrator can select how many copies are saved, something that is not easy to do with the other backup plans . Memeo does this in the background so the user is seldom bothered. Only if your program needs exclusive access to a file being backed-up will there be a conflict but even then Memeo usually just queues the request for later filing.
A good program.
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