|Weighing the options: Pros and cons
||Price Range/Per GB
|Two internal drives in a RAID 1 array
||500GB to 3TB
||$60 - $400 for second drive, depending on capacity/$0.13 -$0.17 per GB
||Fastest; can buy a PC preconfigured this way; no software is required; backups are immediate and automatic; large capacity; prevents data loss from a single drive failure.
||Susceptible to malware, home theft, or disaster; one entire drive is dedicated solely to backup; can't recover accidentally deleted or overwritten files.
||Immediate, automatic, hassle-free backups.
|External Hard Drives
||500GB - 3TB (single drive)
||$85 - $400/$0.13 - $0.17
||Fastest for large capacities; inexpensive; connects via USB, firewire or eSATA; smaller models may require no external power.
||Susceptible to malware, home theft, or disaster; must configure and run backup software.
||Primary storage of large amounts of data.
|Network Attached Storage
||1TB to 80TB+
||$100 - $2000+
||Fast for large capacities; no software is required; backups are immediate and automatic; extremely large capacity; prevents data loss from a single drive failure. inexpensive; connects via Ethernet to be accessed shared by more then one computer. can be accessed from remote locations for field workers. Data backed up across multiple drives for backup.
||Susceptible to malware, theft, or disaster; At least one entire drive is dedicated solely to backup; Maybe able to recover accidentally deleted or overwritten files. Can be accessed/hacked from remote locations across the internet if not properly secured.
||Primary storage of large amounts of data. Immediate, automatic, hassle-free backups.
||$15 - $220
||Small; portable; connects via USB; requires no external power.
||Easy to lose; size makes labeling difficult; must configure and run backup software for easy successive, incremental backups.
||Limited storage; secondary backup.
||700MB (CD) - 50GB
||$0.22 (CD-R) - $50 (Blu-Ray double-sided DVD)
||With the exception of Blu-Ray, discs are very inexpensive; most computers have players/burners; easy to use.
||Slow; limited capacity; susceptible to scratches and physical damage; discs can't be read by all drive types; incremental backups require special software.
||Archiving songs, video, and photos for use on consumer electronics devices.
|Online Backup Services
||250MB - unlimited
||Free - $64.95 per month
||Unlimited storage potential; most secure; nothing to break; safer from theft than local backup; remote file sharing is possible.
||Slowest; monthly fees can be high; requires fast, reliable Internet connection; must trust site's security, longevity.