Plus:
- RAID 1 is not necessary for a backup server. Duplication to a second backup disk (internal or external) can be carried out asynchronously (robocopying, etc.). RAID 1 (or 5) is only necessary for a server: it enables work to continue in the event of disk failure. It does not protect against viruses or clumsiness.
- If you buy several discs, buy them in different series (I've seen 5-year-old discs of the same brand and model fail 2 days in a row).
- There's no need to clone disks on client machines. A single initial backup is all that's needed (and another from time to time).
- Separate data from programs
- Back up data frequently and automatically
- Perform multiple backups (total, incremental or differential).
- Place backups in several physical locations
- Buy lots of USB flash drives for main data files, they're cheap and much faster than burning DVDs (multiply them because they can also become unreadable and easily lost).
- Compress data that can be compressed (a Database compressed to ~16/1, a text file to ~8/1, etc.) Only files that are already compressed gain nothing (jpg, png).
- If your data is confidential, encrypt them (a password of around 15 characters on archive file will take several decades to find on fast machines, so your data won't be of interest to anyone).
- Use a fast, powerful compressor (WinRar outperforms all others for large archives (Perform speed tests on multi-GB archives, and you'll see). Its license is worth the cost (and its very well-done doc is translated)).
Backup, backup, backup...
Especially if you're a professional, keep track of the time it takes to redo lost work. Much more than taking a day to draw up and test your backup plan.
