CLOUDP-303120: fix: Don't panic on deep copy of backup compliance.

[segui-mdb]

The pointers can be nil in which case it will panic. Use the getter to ensure it's always initialized.

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[s-urbaniak]

good stuff, thank you! 🎉 just a small remark to have a better test coverage, else LGTM.

[josvazg]

LGTM