The fastest and most reliable way is to do backups from disk to disk and then to tape, and then keep multiple tapes off site.
A fast way to backup is to an external USB hard drive. But beware, they can also be wiped out by a virus attack. Have at least three USB hard drives, keep two of these off site at all times.
3. Daily, weekly, monthly rotations
The best schedule is to do five daily backups (Mon-Fri). Then do 4 Saturday backups a month. Finally, do separate monthly backups, and keep for three months.
4. Offsite backups
4.Have at least three copies of all your important data, on three separate devices, held off premises at all times.
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5. Online backups
Online cloud backups are a viable solution. Some free solutions are available but remember, the upload internet speed is slow and can be very costly with large amounts of data.
6. Quality media
One of the most cost effective ways is to backup to DVD media. But beware! Cheap DVDs last less than one year and expensive ones last between 5 and 10 years if stored correctly. Commercially created music & video DVDs use a completely different process and can last much longer.