Backup Snapshot Age Tool

Description

Require asOfTimestampSeconds no earlier than snapshotTimestampSeconds and return their difference.

Security administration uses retention periods, control owners, acknowledgments, recovery targets, and test records. Arithmetic and labels can make these records consistent, but they do not demonstrate that a control works or that a policy is adequate.

Require asOfTimestampSeconds no earlier than snapshotTimestampSeconds and return their difference.

When to use this tool

Use Backup Snapshot Age when you need a narrow security-record calculation or formatter under supplied policy values.

How to use the tool and how it works

Enter snapshotTimestampSeconds, asOfTimestampSeconds. Use the units and conventions below.
Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
Read ageSeconds. Use the output convention below.

Require asOfTimestampSeconds no earlier than snapshotTimestampSeconds and return their difference.^[1]

Input field	Meaning and units	Accepted input
snapshotTimestampSeconds	Snapshot Timestamp Seconds	Required. Finite number.
asOfTimestampSeconds	As Of Timestamp Seconds	Required. Finite number.

Output field	Interpretation	Returned shape
ageSeconds	Age Seconds	Required. Finite number.

json

{
  "input": {
    "snapshotTimestampSeconds": 1000,
    "asOfTimestampSeconds": 4600
  },
  "output": {
    "ageSeconds": 3600
  }
}

Limitations and assumptions

Age alone does not demonstrate backup completeness, integrity, restorability, or compliance with recovery requirements.
Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.

Alternative or Complementary methods

Review the complete control evidence, applicable policy, and operational tests before making a security decision.

References

Calculation and input contract: security-studies/backup-snapshot-age — tool.io

Similar or alternative tools

Security Record Retention Date
Parse recordDate as a real YYYY-MM-DD date, add retentionDays in 0-100000 using UTC calendar arithmetic, and require output no later than year 9999.
Work Item Ageing Band
Select the last bound no greater than nonnegative ageDays.