Or get a networked offsite arrangement, don't overlook that option.
I don't overlook that option--I just don't trust it.
There are a number of problems with using a network for your main or only backup system:
- You can't make a bootable clone of your system that way.
- Backup and restore of an entire hard drive can be a very time-consuming affair.
- Automated network backup software that runs in the background may back up system-related databases (for example, your Mail database) in an unstable state, for example while they're being written to, resulting in a potentially corrupt or incomplete backup.
- They require Internet access to work.
- Some Internet companies are now metering Internet access, charging for bandwidth used over a certain ceiling. Backing up a 500GB hard drive will most definitely cross that ceiling, potentially resulting in bandwidth charges that are as expensive as a new local hard drive would be.
- Server outages or problems may compromise the integrity and/or availability of your backup.
- Backup of sensitive data such as financial data, personal information, tax returns, photos, and so on may potentially make that information available to corrupt or inquisitive employees of the data backup company. (Even companies which provide encryption also say in their Ts and Cs that they have access to encrypted data.)
- If there is a hack attack against the backup company, your information on their servers may be compromised.
- The laws surrounding off-site backups entrusted to a third party are murky. For example, case law exists which holds that the government may subpoena your information from the backup company, and also bar the backup company from telling you that they have released your information.
- If a corrupt employee or a hacker does get access to your files, the contracts with off-site backup companies usually indemnify them against damages.
So as you can tell, I'm not keen on network backup services.