What should I look for when selecting a software escrow vendor?

Service
- How easy is it to deal with the vendor?
- Is the vendor flexible in their ability to amend agreements?
- How responsive is the vendor to your questions?
- Are you able to deposit directly from the developer’s git?
Security
- Does the vendor maintain their own data centre?
- Does the vendor maintain ISO27001 and ISO9001 certification?
- Does the vendor provide secure SFTP uplink to deposit data?
Pricing
- Does the vendor charge a setup fee?
- Does the vendor charge a release fee?